<?php

/**
 * @file ajax.inc
 *
 * Handles the server side AJAX interactions of Views.
 *
 * @defgroup ajax Views ajax library
 * @{
 */

/**
 * Menu callback to load a view via AJAX.
 */
function views_ajax() {
    if (isset($_REQUEST['view_name']) && isset($_REQUEST['view_display_id'])) {
        $name = $_REQUEST['view_name'];
        $display_id = $_REQUEST['view_display_id'];
        $args = isset($_REQUEST['view_args']) && $_REQUEST['view_args'] !== '' ? explode('/', $_REQUEST['view_args']) : array();
        $path = isset($_REQUEST['view_path']) ? $_REQUEST['view_path'] : NULL;
        $dom_id = isset($_REQUEST['view_dom_id']) ? intval($_REQUEST['view_dom_id']) : NULL;
        $pager_element = isset($_REQUEST['pager_element']) ? intval($_REQUEST['pager_element']) : NULL;
        views_include('ajax');
        $object = new stdClass();

        $object->status = FALSE;
        $object->display = '';

        $arg = explode('/', $_REQUEST['view_path']);

        if ($arg[0] == 'admin' || (variable_get('node_admin_theme', '0') && $arg[0] == 'node' && ($arg[1] == 'add' || $arg[2] == 'edit'))) {
            global $custom_theme;
            $custom_theme = variable_get('admin_theme', '0');
            drupal_add_css(drupal_get_path('module', 'system') . '/admin.css', 'module');
        }
        // Load the view.
        if ($view = views_get_view($name)) {
            if ($view->access($display_id)) {

                // Fix 'q' for paging.
                if (!empty($path)) {
                    $_GET['q'] = $path;
                }

                // Override the display's pager_element with the one actually used.
                if (isset($pager_element)) {
                    $view->display[$display_id]->handler->set_option('pager_element', $pager_element);
                }
                // Reuse the same DOM id so it matches that in Drupal.settings.
                $view->dom_id = $dom_id;

                $errors = $view->validate();
                if ($errors === TRUE) {
                    $object->status = TRUE;
                    $object->display .= $view->preview($display_id, $args);
                    // Get the title after the preview call, to let it set
                    // up both the view's current display and arguments
                    $object->title = $view->get_title();
                } else {
                    foreach ($errors as $error) {
                        drupal_set_message($error, 'error');
                    }
                }
                // Register the standard JavaScript callback.
                $object->__callbacks = array('Drupal.Views.Ajax.ajaxViewResponse');
                // Allow other modules to extend the data returned.
                drupal_alter('ajax_data', $object, 'views', $view);
            }
        }
        $messages = theme('status_messages');
        $object->messages = $messages ? '<div class="views-messages">' . $messages . '</div>' : '';

        views_ajax_render($object);
    }
}

/**
 * Simple render function to make sure output is what we want.
 *
 * This function renders an object into JSON, and that object contains
 * commands to the ajax response parser on the other side. The actual
 * commands that can be sent are completely dependent upon the client
 * javascript parser, which can be anything, but this function assumes
 * that 'display', at least, will be displayed in some kind of ajax
 * spot or popup.
 */
function views_ajax_render($output = NULL, $title = NULL, $url = NULL, $js = NULL) {
    if (empty($output)) {
        $output->display = t('Server reports invalid input error.');
        $output->title = t('Error');
    } elseif (!is_object($output)) {
        $temp = new stdClass();
        $temp->display = $output;
        $temp->title = $title;
        $temp->url = $url;
        $output = $temp;
    }
    if (!empty($js)) {
        $output->js = $js;
    }

    drupal_json($output);
    exit;
}

/**
 * Wrapper around drupal_build_form to handle some AJAX stuff automatically.
 * This makes some assumptions about the client.
 */
function views_ajax_form_wrapper($form_id, &$form_state) {
    // This won't override settings already in.
    $form_state += array(
        'rerender' => FALSE,
        'no_redirect' => !empty($form_state['ajax']),
    );

    $output = drupal_build_form($form_id, $form_state);
    if (!empty($form_state['ajax']) && empty($form_state['executed'])) {
        // If the form didn't execute and we're using ajax, build up a
        // json command object to render.
        $object = new stdClass();
        $object->display = '';
        if ($messages = theme('status_messages')) {
            $object->display = '<div class="views-messages">' . $messages . '</div>';
        }
        $object->display .= $output;

        $object->title = empty($form_state['title']) ? '' : $form_state['title'];
        if (!empty($form_state['help_topic'])) {
            $module = !empty($form_state['help_module']) ? $form_state['help_module'] : 'views';
            $object->title = theme('advanced_help_topic', $module, $form_state['help_topic']) . $object->title;
        }
        $object->url = empty($form_state['url']) ? url($_GET['q'], array('absolute' => TRUE)) : $form_state['url'];
        $object->js = empty($form_state['js settings']) ? NULL : $form_state['js settings'];
        if (!empty($form_state['#section'])) {
            $object->hilite = '.' . views_ui_item_css($form_state['#section']);
        }

        $output = $object;
    }

    // These forms have the title built in, so set the title here:
    if (empty($form_state['ajax']) && !empty($form_state['title'])) {
        drupal_set_title($form_state['title']);
    }

    return $output;
}

/**
 * Page callback for views user autocomplete
 */
function views_ajax_autocomplete_user($string = '') {
    // The user enters a comma-separated list of tags. We only autocomplete the last tag.
    $array = drupal_explode_tags($string);

    // Fetch last tag
    $last_string = trim(array_pop($array));
    $matches = array();
    if ($last_string != '') {
        $prefix = count($array) ? implode(', ', $array) . ', ' : '';

        if (strpos('anonymous', strtolower($last_string)) !== FALSE) {
            $matches[$prefix . 'Anonymous'] = 'Anonymous';
        }
        $result = db_query_range("SELECT name FROM {users} WHERE LOWER(name) LIKE LOWER('%s%%')", $last_string, 0, 10);

        while ($account = db_fetch_object($result)) {
            $n = $account->name;
            // Commas and quotes in terms are special cases, so encode 'em.
            if (strpos($account->name, ',') !== FALSE || strpos($account->name, '"') !== FALSE) {
                $n = '"' . str_replace('"', '""', $account->name) . '"';
            }
            $matches[$prefix . $n] = check_plain($account->name);
        }
    }

    drupal_json($matches);
}

/**
 * @}
 */
